With us, the cats make a mess everywhere. Every flowerbed, the greenhouse, and simply everything where they can dig – and not only our own two cats (they do this at our place and the neighbor's, I've observed it several times) but also other roaming cats. We have ants everywhere. After I filled my raised bed last year with different layers, including sand, I had ants in it after just a few weeks. I definitely couldn't put a sandbox here. The greenhouse is empty in winter, so without plants, and this winter it apparently served as a nice dry, windless cat litter box, yuck. Piles are still easy to see and remove, but cats don't only do piles^^.
In the next few days, there is supposed to be a significant ground frost regionally again!